Table 2 Variables used in RSM.

From: Experimental, RSM modelling, and DFT simulation of CO2 adsorption on Modified activated carbon with LiOH

Independent numerical Variables

Unit

Symbol

Variable levels

Temperature

°C

X1

30, 50, 70, 90

Pressure

bar

X2

1, 3, 6, 9

Adsorbent amount

gr

X3

0.5, 1, 1.5, 2

LiOH concentration

mol/L

X4

0.5, 1, 1.5, 2

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